LTR501_LUX_CONV
lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data);
lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data);
lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data);